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<!DOCTYPE html>
<html>
    <head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    </head>
    <body>
        <div id="target"  hidden="false" style="height: 100px ;color: purple" >HTML5</div>
        <button onclick="var target=document.getElementById('target');target.hidden=!target.hidden;">show/hidden</button>
    </body>
    
</html>
